malthaner



L F. MALTHANER. COMBINED TELEPHONE AND PHONOGRAPH.

APPLIEA'HON HLED JULY 12-1917. 1,344,918, Patented June 29, 1920.

2 SHEETS SHEET l.

- J. F, MALTHANER.

COMBINED TELEPHONE AND PHONOGRAPH. APPUCATION FILED JULY 2. mm.

, 1 8. Patented June 29, 1920.

2 swans-sac 2,

joins the sound duct.

PATENT OFFICE.

JOHN F. MALTHANEB, OF ATLANTA, GEORGIA.

COMBINED TELEPHONE AND PHONOGRAPH.

Specification of letters Patent.

Patented June 29, 1920.

Application filed July 12. 1917. Serial No. 180,192.

To (1/! whom it may r-orm'ra:

neahnou'n that I, JouN l MALT'HANER, a citizen of the United States, residing at Atlanta, Fulton county, State of Georgia, have certain invented new and useful linrovcmeuts in Combined Telephones and ihonographs. of which the following is a specification.

This invention relates to Combined telephone and phonographs, and more particularly to an attachment for use on dicta- 'phoncs to record telephonic conversations.

it is one of the principal objects of this invention to improve the construction of such recording mechanisms.

In the present arrangement the diaphragm holder is modified and has a hollow boss or sleeve on its top side to adjustably support the magnet.

The sound passage is constructed in such a manner that. when sound enters or do? parts from the diaphragm chamber, it is conveyed around the electro-magnet by means of a circular channel. The greatest depth of the channel is at the point where it The depth of the channel gradually decreases, and it disappears after describing an are right and left from the sound duct and around the magnet. This improved construction is for the purpose of eliminating abrupt angles and to collect sound waves and deliver them to a point as near the center of the diaphragm as is possible with the electroniagnet obstructing the sound duct and occupying thiexact center of the diaphragm holder.

Another object is to provide improved means whereby the excess Weight on the diaphragm holder may be closely adjusted.

The above and other objects and the novel features of the invention will appear from the following description taken in connection with the drawing. in which.

Figure 1 is a side elevation oi the dictaphone speaker head constructed according to the present invention:

Fig. 2 is a front elevation;

Fig. 3 is a bottom plan view of part the diaphragm holder:

Fig. 4 is an enlarged central longitudinal sectional view of the device;

Fig. 5 is a side elevation of a standard dictating phonograph, equipped with my 1nvention, and

Fig. 6 is a. diagram showing the device connected in a telephone circuit.

Referring to the drawing, 10 designates the speaker head of an ordinary dictaphone which is in the form of a hollow cylinder, being provided at one end with a flange 11, whereby it may be attached to the carriage and casing 19, shown in dotted outline in Fig. 1. The carriage 12 is suspended from the feed screw 13 which moves it and the tube 10 with its attached devices longitudinally of the recording or reproducing cylinder 14. The cylinder 14 rotates at a proper relative speed to the movement of the carriage 12 and its attachments.

A sleeve 16 is slidably mounted in the head 10 and its forward end 17 is split and has an eye 18 to receive a pin. The pin in the eye 18 is engageable by suitable devices on the interior of the casing 12 controllable by the lever 19. Within the sleeve 16 there is a second sleeve 20 which is secured to the sleeve 16 by a cross pin 21 to allow a slight amount of play of the sleeve 20.

The diaphragm holder is made of aluminum and consists of a tapering sound tube-22' which is enlarged at its inner end andis pivoted in the interior of the sleeve 20 by pins 23, the axes of which are at right angles to the axis of the pin 21. The pins 23 also engage the ends of the forked rod 24 which extends out of the rear end of the tube 10 and into a tube 25 which has threaded connection .at one end with the tube 10.

The rod 24has a threaded outer end which fits in the threaded cavity 26 of the weight 2 balance for the excess weight on the other end of the diaphragm holder and is provided with a slotted head so that it may be. adjusted by means of a screw-driver in' sorted through the opening 30 of the tubular part 31 on the threaded end 29 of the tube 25. A speaking tube P is detachably coniIiected to the tubular part 31, as shown in The outer end of the diaphragm holder consists of a substantially circular part 32, having a peripheral flange 33 within which the diaphragm 35 is fitted. The diaphragm is held in place by the inner and outer gaskets 34 at the edge thereof. and a sound chamber 39 is thus formed which is closed on one side by the diaphragm 35 and opens The weight 27 serves as a counter" ill! impositc llu' l'tHtll' portion oi' the diaphragm through the passages 51 and 52 into the sound that 22'.

circular plate or disk id is secured to the outer Sl lt of the diaphragm 35 at the center ol' the latter. The disl; Sit} carries the reproducing and recon-(line styli. or sapphires ll and 3B which are adapted to be adjusted to engage the surface of the record ll. (he reproducins sa 'iphirc ll? being provided with he usual hall end.

On the inner side of the diaphragm 35 there is a sound space Ii and opposite the disk Ilti there is another disk it! composed of ferric metal. The dish i l is secured to the diaphragm 35 to vibrate therewith and it constitutes the armature for the electr magnet 41.

The casing of the tlW'll'tr'llltlpfillfl. ll consists of a cylindrical all t2 and a top wall 43. The casing oi the magnet is of silt iron and is adjustahly fitted in a. hollow hoss or sleeve ii on the top of the i'lhiphrngrni holder. the boss ll. disks Ill and i and chwtI'm-magnet 4| being coaxial. The din-- phragni holder is provided with Teinforw in; ribs 45.

The magnet casing projects above the upper edge of the boss 4-4 and at its center it has a soft iron core 46 held in place against the top wall by the screw 4:7. The magnet winding). is disposed in the annular space between the soft iron core 46 and Wall 42, the ends thereof being protected by the insulating beads 46'. lhe magnet is ad justed into close proximity with the face of the disk 41) so that when the magnet is energized it will vibrate the disk 40 and the diaphragm to which the latter is attached. The magnet is held in its adjusted position in the boss 44 by a set screw 44'.

The sound tube opens at 49 into the space 39 between the diaphragm 35 and the bottom face 50 of the holder. The hollow boss 44 communicates with the sound passages 22' and consequently when the magnet is inserted in place in the boss a part of the cylindrical wall 42 of the magnet shell will serve as part of the Wall of the sound pas sage. From the bottom plan view, Fig. 3, and the central sectional view, Fig. 4, it will be seen that the tapering grooves or branches 51 and 52 open into the sound passage 22 on one side of the magnet, extend around the end of the latter and disappear at .the opposite side of the magnet from the duct 22', thereby allowing the sound entering the sound duct 22' to strike'the dia phragm close to the center of the latter.

The curved tapering grooves 51. and 52 in the face 50 of the holder and on opposite sides of the shell of the magnet lOlHl in effect continuations of the sound passage The grooves iii and Sit are the same depth as he passage 21.? nhvil' th y ioin the latter it... from thence they taper in th opposite ide oi the niap'wi Win-re, they disappear. Th sound passag is thus con wtl'lllit l in such a manner that when sound waves enter or depart from the diaphragm llllllillltl .39 the are conveyed around the elevnomagnet and by gradually drawing in the roof of the passage the sound is gently forced down upon the diaphragm. Thls manner of construction eliminates abrupt angles and conducts the sound waves as near the center of the diaphragm as is possible with the clertro-magnet flttlipylllg the exact center.

he Wires I 3 and M are connected to the terminal clips and 56 secured to the flange 11 by swreu s ii and 5:5. The screws i and also lu e the magnet loads 59 and (3') connected iwl' tn. 'ihc magnet hauls extend thr ug n top null i ol the shell or th nmmui in tin am i 1 'li tho windin therein.

in Fig. i. the dia van-i faith-r is shown in r cording 5w :sWi in this position the rigid up lv' fir; ol' right nhll f bracket seems. so Eh i llh i b the :i 'FWd ('ii', is lm-aF- iii-hind the hump ii, on 1hr sound tube 3;; it will be mulersioml 'iiiat when the diaphragm holder is set in pro ducing position the hump will h behind the upstanding part; til and when tluholde i in central position the hump 1 5 will rest. .t the upper end of the upstanding part it in Fig. 5. the invention i.- shown zip-- plied to a dictating machine. in nliitli the motor for rotatin; the feed sci-cw l i is lo cated within a casing 65] sin'iportml in a table 66. The operation of the sew-v i i hy the drivin; mechanism in the asin; 7G is controlled by a toot switch (37 in a well known mannrf In Fig. 6. I have diagrammatically .Jhnun the manner in which the magnet is connected in circuit with a tele )l'lOIlC line having the branches L, L. I IQIDltSGDti-f an auxiliary transformer in the form of a standard repeating coil. the two opposite windings e and o of which are connected in series with the lines L, L, respectively. and with the suhst-ribers telephone set T.

The two windings c and c of the repeating coil. are each located between the windings c and c on opposite sides of the re peating coil, and are connected in series with the battery B and the Windin of the elehtro'magnet 41. The switch S is located in, the circuit of the electro-magnet so that the latter may be out into and out of circuit with the telephone line.

When it is desired to record telephonic conversations, the switch S is closed and the dictaphone is started. The vibrations of the armature of the magnet causes a record to he produced on the cylinder 14. which record may later be reproduced. W'hen the lit part which is curved around the 'magnet near the diaphragm.

the direct current ceases to flow. The high frequency undulating currents flowing 311 the telephone circuit are converted by the transformer and superposed upon the direct current flowing through the electro magnet winding, causing variations in the. magnetic stress under which the diaphragm is held. thus producing vibrations of the diaphragm and the recording sapphire. connected to it. By means of the attachment it is also possible to produce variations in the electrical conditions of the line to cause vibrations mrresponding to a record.

\Vhile l have shown and described the device in detail. I wish it understood that the invention is not limited to the exact construction shown.

Having thus described the invention, what is claimed and desired to be secured by Let ters Patent is: r

i. In a device of the combination of a diaphragm holder. 2:. dia phragm mounted thereon, an electromagnet carried by said holder opposite the dia phragm, and an armature for the magnet secured to said diaphragm, said diaphragm holder having a sound. passage which extends therethrough, said passage having a part which extends round said magnet. 2. In a device of the class described, the combination of a diaphragm holder having a part provided with a hollow boss, an electro-magnet fitting the boss, a. diaphragm carried by said holder, and means on the. diaphragm constituting an armature r'or the magnet and whereby the diaphragm vihrated.

3. In a device of the class described. the combination of a diaphragm holder haxing a part provided with a hollow l)0S:-, an electromagnet having a shell fitting the boss, a diaphragm carried by said holder, and means on the diaphragm constituting an armature for the magnet and whereby the diaphragm is vibrated, said diaphragm holder having a sound passage. which extends therethrough, said passage having a end of the 4. In a device of then-lass described. the combination of a diaphragm holder comprising a disk-like part, and a diaphragm mounted on said disk-like part and spaced from the face thereof whereby a sound chamber is formed between said face and the diaphragm, a magnet for vibrating said class described, the

diaphragm, said holder having a sound passage extending therethrough and opening into said chamber, said passage at the point where it opens into said chamber being curved around said magnet and tapering from a point on one side of said magnet to the opposite side thereof.

6. In a device of the class described, the combination of a diaphragm holder comprising n disk-like. part, a diaphragm mounted on said disk-like part and spaced from tbc face thereof whereby a sound chamber is formed between said face and the diaphragm, an elcotromagnet on said disk-like part and coaxial therewith, and means on said diaphragm constituting an armature for the magnet, said holder having a sound passage extending therethrough and opening into said cl'iamber, the opening of said passage into the chamber being through the medium of a curved and tapering channel extending partly around said magnet.

6. In a i levice of the class described, the combination of a diaphragm holder having a tubular part and a dislclike part, a dia phragm mounted on the disk-like. part, recording and reproducing means on the o'nter side of the diaphragm, a hollow boss on the top wall of said disk-like part. a magnet fitting said boss and coa :ia.l with the diaphragm, and means on the inner side of said diaphragm. constituting an armature for said magnet, said diaphragm being spaced from and forming a chamber with the bot.- tom face of said disk-like part of the holder, said holder having a sound passage therein extending through the tubular part and opening into said chamber, the entrance of the sound passage in the Face of said disklike pa rt being curved around said magnet.

T. in a device of the class described, a diaphragm holder having a diskdike part, a bolloiv boss on the top wall of said disklike part. a. magnet shell fitting said boss, a diaphragm mounted on the under side of the disk-like part and spaced therefrom to form a hamber between the diaphragm and the bottom face of the disk-like part, said chamber having a sound passageway extcnding therefrom and opening into a circular channel, said magnet shell comprising one wall of said channel. said channel extending around a part of said magnet shell, the entrance opening of said channel into the chamber being coaxial with the poles of the magnet and diaphragm.

3. in a device of the class described. the combinntion of a diaphragm holder having a sonml duct, a diaphragm mounted on said holder and forming one wall of a chamber in communication with said sound duct, a magnet n'iounted on the holder and capable of vibrating the diaphragm, means for pivotally supporting the holder, and means for adjusting the holder comprising an adjust able counterbalance having a part secured to the diaphragm holder.

9. In a device of the class described, the combination of a diaphragm holder having a sound duct, a diaphragm mounted on said holder and forming one wall of a chamber in communication with said sound duct, a mag; net mounted on the holder adjacent the diaphragm and capable of vibrating it, means near one end of the holder for pivotally supporting it, and means for adjusting the diaphragm holder comprising a rearwardly extending part of the holder having an adjustable weight carried thereby.

10. In a devicr of the class described, the combination of a diaphragm holder comprising a tubular part and disk-like part, a diaphragm on the disk-like part, a magnet on the disk-like part and disposed adjacent the diaphragm, means for pivot-ally i-;upporl' ing the holder at the end of the tubular part. a rearwardly extending rod ronlni'trd to the tubular part, and a weight adjustahl mounted on said rod to rounti-r-balanrr tln: cXi-ess weight of parts ot' the holder.

ll. In a device of the class described. the combination of a hollow speaker head hav ing an opening therein. a diaphragm holder having one end pivot-ally mounted in said head, and means on the interior of said head for counterbalancing a portion of the weight on said diaphragm holder, said counterhalancing means being adapted to be adjusted by means of an instrunu-nt inserted in said opening in said head.

12. In a device of the Class described, the combination of a hollow speaker head haw ing an opening in one end thereof, a dia' phragm holder having one end thereof piu oted in the speaker head, and an adjustable eonnterbalancing weight connected to said holder and having a part disposed opposite said opening, said part of the counterbalancing weight opposite said opening being slotted whereby the end of a screwdriver may be inserted through said opening to adjust said weight.

13. Tu a device of the class described, the combination of a diaphragm holder comprising a tubular part and a disk-like part, a diaphragm mounted on the disk-like part and spaced from the face thereof whereby a sound chamber is formed between said face and the diaphragm, said sound chamber bis having an outlet through said tubular part,

an electro-magnet on the disk-like part and disposed adjacent the diaphragm, means onthe inner side of the said diaphragm constituting an armature for said magnet. record in; and reproducing means on'the other side a shell litting the boss.

of the diaphragn means l'or pivolally supporting the holder at the end of the tubular part, a rcarnardlv extending rod connected to the tubular peat, and a weight adjustably mounted onfsaid rod to lltlllllllltlltlllCG the excess weig'btiot' parts on the holder.

14-. In airapparatus ol the rlass described, the combination of a diaphragm holder comprising a tubular sound duct and a disk-like part. a diaphragm mounted on said disk like part and spaced from the face thereof, whereby a sound rhamber is formed between said fare and the diaphragm, the top part of said dislelike part being provided with a hollow boss, an iron disk on the inner side of said diaphragm, an eleetro-magnet having a portion of said magnet shell comprising one wall of a cir ular entrance channel connecting said. sound din-t with said sound chamber, the pulp piece ol' said magnet arranged opposite said ir n d1 :li, means for pivotallv supporting the holder at the end of said tubular part. a rearwardlv extending rod ('(Hllltl'tt'll to said tubular part. and a weight adjustablv mounted on said rod to (l llltitlllillttlltU the excess eight oi the parts of the holder.

l5. in an apparatus oi" the class described, the combination of a phonographic speaker head, a disk-like part forming the top wall and sides of a sound chamber, a tubular part constituting a sound duct to said sound chamber and pivotally supported within said speaker head. a phonographc vlinder, a phonographir diaphragm forming the bottom wall of said sound chamber and mounted to vibrate in response to sound waves entering said sound duet, a stylus movable in response to movements of said diaphragm. an armature connected to the inner side of said diaphragm, a hollow boss on the top wall of said dislclike part, an cleotro-magnet baring an iron shell fitting the boss, the pole piece of said magnet extending into sai sound chamber at a point opposite said armature, the distance between the pole piece of said magnet and said armature being adjustable, means for maintaining the mag-v net in said hollow boss in a fixed adjusted position, said magnet being capable of directing changes in flux density to said. armature whereby said. stylus will register said changes upon the phonographic cylinder, and whereby said dia hragm will simultaneously set up soun waves within said sound chamber to be conveyed through said duct to said speaker head.

In testimony whereof I aflix my 3i JOHN F. lvtr'tlflli ib'fljll? 

